This title appears in the Scientific Report :
2023
Observation of horizontal temperature variations by a limb-sounding spatial heterodyne interferometer
Observation of horizontal temperature variations by a limb-sounding spatial heterodyne interferometer
A limb-viewing spatial heterodyne interferometer is developed to observe temperature in the mesosphere and lower thermosphere. This can be used to measure atmospheric waves with small vertical wavelengths. The instrument measures the O2 atmospheric A-band airglow emission in the near-infrared. It is...
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Personal Name(s): | Ntokas, Konstantin |
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Kaufmann, Martin / Ungermann, Jörn / Augspurger, Tobias / Olschewski, Friedhelm / Neubert, Tom / Riese, Martin | |
Contributing Institute: |
Stratosphäre; IEK-7 |
Imprint: |
2023
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Conference: | SPIE Remote Sensing 2023, Amsterdam (Netherlands), 2023-09-03 - 2023-09-06 |
Document Type: |
Conference Presentation |
Research Program: |
Climate Feedbacks |
Publikationsportal JuSER |
A limb-viewing spatial heterodyne interferometer is developed to observe temperature in the mesosphere and lower thermosphere. This can be used to measure atmospheric waves with small vertical wavelengths. The instrument measures the O2 atmospheric A-band airglow emission in the near-infrared. It is visible during day- and night-time, allowing a continuous observation. The image is taken by a 2d detector. The optical system conserves the 2d spatial temperature information. The spectral information is superimposed in horizontal detector direction. The usual processing thus uses the horizontal detector dimension to resolve the spectral while ignoring the underlying spatial information. The altitude coverage is given by the vertical detector direction, resulting in a finely resolved vertical temperature profile with one image. We therefore investigate a new processing method which exploits the spatial information along the horizontal axis as well. We propose to split the interferogram into two halves, mirror it around the center and perform a retrieval on both sides separately, obtaining two spatial cross tracks of independent temperature data. Assuming that the instrument views backward, consecutive measurements give along track sampling. Combining this with the split interferogram method and the usual fine vertical resolution of the instrument, it resolves a 3d temperature field which allows to obtain some information on 3d propagation characteristics of atmospheric waves. To this end, we study the feasibility, potential and limitation of the split interferogram method. We will discuss the impact of horizontal temperature variation onto the retrieval result. We show the impact of background temperatures on the retrieval including noise propagation. Furthermore, we discuss the influence of apodization onto the retrieval of split interferograms. |